JP3375601B2 - Typesetting replacement method and device - Google Patents

Abstract

The printing form change process involves feeding the printing form with the print-end (DE) edge going foremost into the corresponding printing device. The cylinder is rotated in the opposite direction to that for printing to pull the printing form onto it. The print-start (DA) edge of the form is then fed into the corresponding fixing device of the form cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a typesetting method and apparatus described in the superordinate concept of the claims.

[0002]

2. Description of the Related Art In the case of a sheet-fed offset printing press, a typesetting plate made as a printing plate is held on a plate cylinder (plate cylinder) by a fixing device. Each side is provided as a tension bar. The tightening of the printing plate is performed by applying a tensile force after fixing the plate.

In order to remove a used plate from the plate cylinder, first, the fixing device provided at the end of printing is loosened, so that the end of the plate becomes a free end. The typesetting is removed from the plate cylinder by rotating the plate cylinder in the opposite direction (rotating in the direction opposite to the rotating direction during printing).
In the case of a semi-automatic or full-automatic printing plate changing mechanism, the printing plate thus sent out from the printing mechanism is sent to a collecting chamber or other accommodating device. for that purpose,
After loosening the fixing device provided on the starting side of the printing, the half cylinder is rotated in the opposite direction until the composition is completely removable from the cylinder. Here too, a semi-automatic or fully automatic printing plate changer is used, by means of which the plate can be removed from the cylinder and the printing mechanism.

In order to replace a new typesetting plate, the cylinder is first rotated so that the printing start side of the typesetting plate introduced from the tangential direction to the cylinder is positioned so that it can be inserted into the corresponding fixing device. After the corresponding end of the typesetting plate is inserted into the fixing device provided on the printing start side, the printing plate is fixed (clamping). Continue to rotate the plate cylinder forward until the composition is stretched almost completely around the plate cylinder. Further, a corresponding tension force is applied to the plate by the pressing roller, and as a result, the plate comes into close contact with the outer circumference of the cylinder smoothly.

The plate cylinder is rotated forward until the end-of-press side of the typeset can be inserted into the fixing device provided on the end-of-print side of the cylinder by means of the pressure roller assigned to it.

After fixing (clamping) the trailing end (printing end side) of the printing form, tension is applied from the printing end fixing device to tighten the printing form. This pulling force can especially be generated by a spring element. A device for automatically changing the plate type of a plate cylinder, which carries out the working steps briefly described above, is known from DE 4215969 and EP 0654349. Furthermore, from EP 0660777 A1 is known a device for supplying and ejecting the plate cylinder plate form, in which case both the plate supply and the plate discharge are carried out in the same direction of rotation of the plate cylinder. Therefore, the typesetting plate to be taken out is unfixed at the printing start side, advanced to the printing start side, and sent to the corresponding accumulation chamber.

What is common to each of the above-described devices is that the typesetting is performed on the side of the flapping device, that is, from the side of the printing mechanism where the flapping device of the sheet-fed printing press is provided. is there. In the case of a unit type sheet-fed printing machine, especially a sheet-fed offset printing machine, the side on which the tilting device is provided usually has good proximity (accessibility),
In other words, if you open the sliding or flap type cover,
Access to various parts of rubber sheet cylinders and plate cylinders (plate cylinders). The parts of the printing mechanism which face the feeder side of the sheet-fed printing press are usually hidden by the rollers of the inking device and the dampening water device, so that the typesetting cannot be changed from this side. For this reason
A device for semi-automatic and full-automatic change of typesetting is also attached to the tilting device side of the printing mechanism.

In the case of a sheet-fed printing press, especially a sheet-fed offset printing press in which the back-printing mechanism is placed in front of the other printing mechanism, the arrangement of the plate cylinder causes the rotation of the plate-cylinder and also the direction of rotation of the plate-cylinder. The accessibility of the plate cylinders is problematic due to the arrangement of the working dampening and / or inking devices in combination with the rollers. This is especially true when the backing mechanism with the corresponding plate cylinder is located below the paper feed tray of the paper feeder. For example, DE 4343616 A1 shows a sheet-fed offset printing press with a backing mechanism in front.

Due to the limited accessibility of the plate cylinders below the backprinting device, the known methods of typesetting and their corresponding devices are not available at all or are available without additional structural work. Can not.

[0010]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a plate cylinder of a backing device, which is none other than the above.
Extending the method and the apparatus for carrying it out as described in the preamble of the method and device claims, so that the plate cylinders of a sheet-fed printing press can be easily replaced without the need for additional components. Is.

[0011]

This problem is solved by the features claimed in the typesetting method and device. Developments of the invention are described in the corresponding dependent claims.

The invention contemplates that the end of the printing end of the plate to be supplied is first fixed to the corresponding fixing device of the plate cylinder. Then, the plate cylinder is rotated in a rotation direction opposite to the rotation direction at the time of printing until the new typesetting covers the outer circumference of the plate cylinder almost completely. Subsequently, the end of the typesetting start side is fixed to the corresponding fixing device.

In order to send out the used composition, the plate cylinder is rotated in the same rotational direction as when printing, and at that time, the end on the printing start side of the composition is removed (fixed). After rotating the plate cylinder in the same rotation direction as when printing, the plate can be taken out by hand, for example. It is also possible to attach a storage device corresponding to the printing plate to the plate cylinder and send the typesetting plate to the storage device.

The plate cylinder is rotated in the same rotational direction as when printing, until the end of the typesetting end of the printing plate can be unfixed. The plate cylinder is stopped at this position for a short period of time, depending on the shape of the fixing device corresponding to the end of the plate after printing on the end of printing. This is because the actuating device provided correspondingly is operated.

In the present invention, the supply and discharge of the lithographic plate to / from the cylinder is carried out in the direction of rotation of the cylinder opposite to the conventional method. In this case, the end of the printing end of the typesetting plate is first fixed to the cylinder, and then the end of the subsequent printing start side is covered. The used composition is sent out in the same way. In this case, first, the fixation of the end on the printing start side of the typesetting plate is released, and the typesetting plate is sent out from the cylinder by rotating the cylinder forward.

By feeding a new type from the end of printing, and also by turning the plate cylinder in the direction opposite to the rotational direction at the time of printing in order to cover the type on the cylinder, the type is moved to the rubber sheet cylinder, dampening water mechanism. And / or can be replaced from the area between the inking features. In the case of a unit-type sheet-fed offset printing press and in the case of the back-printing mechanism of a sheet-fed offset printing machine in which the plate cylinder is located below the corresponding impression cylinder, this also applies to the paper feed side. That is, the typesetting can be exchanged from the paper feeding side.

The method of the present invention is preferably used for the typesetting of the back printing mechanism of a sheet-fed offset printing machine. In this type of sheet-fed offset printing machine of the unit type, the back printing mechanism is preceded by the printing mechanism of the first front printing, and in this case, the typesetting of the first back printing mechanism is easily replaced by the method of the present invention. it can. If a cover having a shape corresponding to the plate cylinder of the back printing mechanism is provided, the possibility of comfortable and hassle-free replacement work can be obtained. The method and the device can likewise be used in a lacquer device of a sheet-fed offset printing machine when the plate cylinder interacts directly with the impression cylinder.

Further, the method of the present invention allows the use of plate cylinders in the backing mechanism or lacquer, which are similar to the cylinders of other printing mechanisms in terms of structure and fixing device to the plate ends. Become. In this case, the plate cylinder of the reverse printing mechanism rotates in the opposite direction of rotation during printing. That is, the fixing device provided on the printing start side in the case of the plate cylinder of the front printing mechanism is provided on the printing end side of the printing cylinder of the back printing mechanism. Similarly, the fixing device provided on the printing end side of the front printing mechanism is provided on the printing start side of the plate cylinder of the back printing mechanism.

In a preferred embodiment of the invention, successive work steps are performed automatically. For this purpose, a fixing device provided at the end of printing of the plate cylinder is provided with a plate confirmation device made as a sensor or an electrical contact. This plate identification device, for example designed as a registration pin, can generate a signal. After the new set is supplied, this signal allows the drive cylinder to rotate the plate cylinder in the direction intended for the new set. In another preferred embodiment of the invention, it is intended that the fixing device provided on the printing start side of the plate cylinder also be provided with a sensor for confirming whether the plate is in the correct position for registration. After covering the outer periphery of the plate cylinder with the typesetting plate and inserting the printing start side region into the corresponding fixing device, it is possible to signal on the display device that the typesetting plate is in proper contact in registration. If the plate identification device, which is attached to a fixing device provided on the start side and / or the end side of the printing, is made as an electrically inquirable register pin, the corresponding punching is applied to the start side of the typesetting and / Or rub on the end of the printing end.

The device according to the invention comprises a drive with a control unit by means of which the plate cylinder is
When applying a new typesetting, it can be rotated in the direction opposite to the rotation direction at the time of printing. The drive assigned to the plate cylinder may in particular be the main drive of the printing press. For typesetting, the main drive is correspondingly controlled in the manner already described. According to one development of the invention, a plate identification device provided on the printing start side and the printing end side of the plate cylinder is also connected by a signal to a control device in front of the drive. This allows automated program progression. That is, it is possible to first turn the plate cylinder into a predetermined position and then insert the newly supplied end of printing of the typesetting plate into the corresponding fixing device first. When the plate identification device placed there issues a signal that it is in the correct position, the fixing device is closed (controlling the corresponding fixing device) and the plate cylinder moves in the direction of rotation intended to cover the new typesetting. That is, it is rotated in the opposite direction to the direction of rotation toward the end of printing. The plate cylinder then stops at the position where the start side is inserted into the fixing device assigned to it.

After inserting the start side of the printing into the fixing device assigned to it (for example by actuating the pressing roller or the like), the actuating device for detecting the starting end of the typesetting is activated and the corresponding fixing This operation is continued until there is a signal from the plate identification device located on the device that typesetting (the front end of the plate) is present. Then, the print start area of the composition is fixed (clamping).

[0022]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a unit type sheet-fed offset printing machine having two printing mechanisms 1 and 2. In the printing mechanisms 1 and 2, the plate cylinder 3 interacts with the rubber sheet cylinder 4 and the impression cylinder 5 (twice the size) by a known method. The transport of the sheet between the impression cylinders 5 and to the first impression cylinder 5 of the first printing mechanism 1 takes place via the feed drum 6. The first printing mechanism 1 is preceded by a backing mechanism, which comprises an impression cylinder 7, a rubber sheet cylinder 9 and a plate cylinder 10 arranged between two transport drums 6, 8. . The rubber sheet cylinder 9 and the plate cylinder 10 of the back printing mechanism are arranged below the impression cylinder 7, and as a result, the dampening water device 11 and the inking device 1 are provided.
2 is also arranged below the plate cylinder 10. Although not shown in FIG. 1, the sheet feeding device of this printing machine is placed in front of the right side of the back printing mechanism.

Since the impression cylinder 7, the rubber sheet cylinder 9, the plate cylinder 10, and the rollers of the dampening water device 11 and the inking device 12 are arranged as shown in FIG. For replacement, the plate cylinder 10 is accessible from the right side, i.e. in the direction of the feeder. Correspondingly operable cover elements are arranged in this area, which can be opened when changing the composition.

2 to 9 are enlarged partial views of the back printing mechanism, showing the impression cylinder 7, the rubber sheet cylinder 9, the plate cylinder 10 and the like. Outer cover element 13
Also shown is the inner cover 14 which can be turned to a total of three positions. The plate cylinder 10 has one hole in which a bar-shaped fixing device 1 having a printing start side DA and a printing end side DE, respectively.
5, 16 are provided. These fixing devices are manufactured by a known method, and the fixing device 16 (bar) provided on the printing start side DA grips and pulls the covered type plate so that it can be turned in its entirety. . A pressing roller 17 further interacts with the plate cylinder 10, which roller can be brought into and out of contact with the plate cylinder.

The inner cover 14 can be turned into three positions, and in particular in FIGS. 2 to 7 it assumes a horizontal position. The surface of the inner cover 14 and a part of the cover 13 thus form a horizontal support for the typesetting 18 to be supplied.

As shown in FIG. 3, a new typesetting plate 18 is supplied to the plate cylinder 10 through a gap formed between the upper part and the lower part of the outer cover 13. In this case, the plate cylinder 10 is rotated in advance so that the fixing device 15 (tension bar) provided at the printing end side DE is used to form the plate 18.
Let's take a position so that we can grasp the corresponding end of. In order to roughly align the left and right registration directions of the plate 18 (axial direction of the plate 10), an alignment device is arranged above the horizontal portion of the cover 13 and / or the inner cover.

The typesetting plate 18 shown in FIG.
After being inserted into the fixing device 15 of the end-of-printing side DE of the plate cylinder 10 through the gap between the three (FIG. 4), the actuator assigned therefor is actuated to clamp the end-of-printing side DE of the typesetting plate 18. . As a result, the printing end side DE of the typesetting plate 18 is fixed to the plate cylinder 10.

After the typesetting plate 18 is fixed to the plate cylinder 10 at the end DE of the printing (FIG. 4), the plate cylinder 10 is rotated here in the direction opposite to the rotation direction at the time of printing (see FIG. 2). To FIG. 5), which results in plate cylinder 1
Cover the outer circumference of 0 with typesetting 18. At this time, the typesetting plate 18 moves between the plate cylinder 10 and the rubber sheet cylinder 9.

The plate cylinder 10 is rotated in the rotation direction shown in FIG. This is because the printing start side of the printing plate 18 faces the gripping area (gap) of the tension bar until the printing plate 18 completely covers the outer circumference of the printing plate cylinder 10 and the contact of the pressing roller 17, and the fixing provided on the printing start side DA. Continue turning until ready to insert into device 16 (FIG. 6). The fixing device 16 of the printing start side DA can change its entire direction, and by turning it forward, the printing start side DA of the typesetting plate 18 is gripped and then clamped (FIG. 7). . By applying a force acting in the outer peripheral direction, the fixing device 1
By the spring element provided in 6, the typesetting 18
Tighten.

In order to eject the plate 18 in the plate cylinder 10, the plate cylinder 10 is rotated to the position shown in FIG. 8 and the fixing device 1 for holding the printing start side DA of the plate 18 is held.
Remove 6. When the plate cylinder 10 is rotated in the rotation direction during printing, the unfixed end of the printing start side DA of the plate 18 is sent out from the plate cylinder 10. As shown in FIG. 9, a part of the outer cover 13 is flap-opened to take out the plate 18, and the inner cover 14 is also tilted to the lower position. The plate cylinder 10 is rotated in the rotation direction at the time of printing, and the position shown in FIGS. 2 to 4 is taken until a new typesetting plate 18 can be inserted and after the fixing device 15 for holding the printing end side DE is removed. , Keep turning until you can remove the typesetting plate 18 from the plate cylinder.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a unit-type sheet-fed offset printing machine in which a back side printing mechanism is installed in front of a front side printing mechanism.

FIG. 2 is an enlarged cross-sectional view of a main part of a back printing mechanism.

FIG. 3 is an enlarged cross-sectional view of a main part of the back printing mechanism, showing a state in which a new typesetting plate is supplied to the plate cylinder.

FIG. 4 is an enlarged cross-sectional view of a main part of a back printing mechanism, showing a state in which a plate is fixed to a plate cylinder at the end of printing.

FIG. 5 is an enlarged cross-sectional view of the main part of the back printing mechanism, showing a state in which the plate cylinder is rotated in the direction opposite to the rotation direction during printing, thereby winding the composition plate around the outer periphery of the plate cylinder. .

FIG. 6 is an enlarged cross-sectional view of the main part of the back printing mechanism, showing a state in which the printing start side of the typesetting plate is kept rotated until it can be inserted into the fixing device.

FIG. 7 is an enlarged cross-sectional view of the main part of the back printing mechanism, showing a state in which the fixing device on the printing start side grips the printing start side of the forme, and then clamps it.

FIG. 8 is an enlarged cross-sectional view of a main part of the back printing mechanism, showing an initial position when the plate in the plate cylinder is discharged and a printing start side of the plate removed from the fixing device.

FIG. 9 is an enlarged cross-sectional view of a main part of the back printing mechanism, showing a state during a discharging process.

[Explanation of symbols]

1 printing mechanism (front printing) 2 Printing mechanism (front printing) 3-plate cylinder (front printing mechanism 1, 2) 4 Rubber sheet cylinder (front printing mechanism 1, 2) 5 impression cylinder (front printing mechanism 1, 2) 6 Transport drum 7 impression cylinder (reverse printing mechanism) 8 conveyor drum 9 Rubber sheet cylinder (reverse printing mechanism) 10-plate cylinder (reverse printing mechanism) 11 Dampening water device (reverse printing mechanism) 12 Inking device (reverse printing mechanism) 13 cover (outer cover) 14 cover (inner cover) 15 Fixing device DE (clamping bar) 16 Fixing device DA (tension bar) 17 Pressure roller 18 typesetting DA printing start side DE end of printing

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Berthold Säve Germany D-63110 · Rodgau Freiheer-von-Stein-Strasse 35 (72) Inventor Bernd Lintner Germany D-63150 · Heusenstein Hochbergstraße 51 (72) Inventor Helmut Schilt Germany D-61449 Steinbach / TS im Wingersgrunt 148 (72) Inventor Reinhold Heilmann Germany D-63808 Haibach Spessart Strasse 1 (56) Reference JP-A-7-186370 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41F 27/12 B41F 7/02 B41F 23/08 B41F 33/00 B41F 33/14

Claims (10)

(57) [Claims] 1. In a method of replacing a printing plate of a sheet-fed printing press, in particular a sheet-fed offset printing press, that is, one end of the printing plate is previously drawn into a plate cylinder and fixed to a fixing device assigned to this end. In the typesetting exchange method, cover the outer periphery of the plate cylinder by rotating the cylinder, fix the other end to another fixing device of the plate cylinder, and then apply tension to the typeset to tighten it. Pre-insert the end of the plate at the end of printing into the corresponding fixing device, and then turn the cylinder in the direction opposite to the direction of printing to cover the plate, and then put the end of the plate at the start of printing on the plate cylinder. A method of replacing typesettings, characterized by inserting into a corresponding fixing device of. 2. The method of exchanging a plate according to claim 1, wherein the plate-making end of the plate-making start side is inserted into a corresponding fixing device and then a tensile force is applied to tighten the plate-making plate from the plate-printing start side. 3. The method of claim 1, wherein a sensor detects the position of the end of the plate at the end of printing on the plate cylinder fixing device. 4. The method of replacing a plate in any one of claims 1 to 3, wherein the position of the printing start side end of the plate in the plate cylinder fixing device is detected by a sensor. 5. The method of replacing a plate composition according to claim 3, wherein the plate composition inserted into the fixing device is fixed according to the detection of a sensor. 6. A sheet-fed press, in particular a sheet-fed offset printing press, in a device for exchanging the plates, that is, for carrying out the method according to claim 1, a fixing containing the printing start end of the plate contacting the plate cylinder. A device (16), a fixing device (15) for accommodating the end of printing end of the plate which contacts the plate cylinder, and a drive device and a control device assigned to the plate cylinder for rotating the plate cylinder in a predetermined direction. In the typesetting exchange device, after the end of printing (DE) of the typesetting (18) is fixed to the fixing device (15), the start of printing (DA) end is accommodated in the fixing device (16) assigned to it. Up to this, the typesetting exchange device is characterized in that the plate cylinder (10) can be rotated by a drive device in the direction opposite to the rotation direction during printing. 7. The plate-type changing device according to claim 6, wherein the plate cylinder (10) is provided in a back-printing mechanism of a sheet-fed offset printing press. 8. A plate cylinder (10) used in a sheet-fed offset printing machine in which a front side printing mechanism (1, 2) is provided with a back side printing mechanism, and a plate cylinder (10) is a fixing device (1) at both ends of a typesetting plate (18).
5, 16) in terms of structure and arrangement, the front printing mechanism (1,
It is almost the same as the plate cylinder (3) of 2), and in this case, the plate cylinder (10) of the back printing mechanism is the front printing mechanism (1,
The typesetting device according to claim 6 or 7, wherein the typesetting device is rotated in a rotation direction opposite to that of the cylinder (3) of 2). 9. A fixing device (15) for housing the end of printing (DE) of the plate (18) with respect to the plate cylinder (10) is fixedly attached to the cylinder, and also the plate of the plate (18) is printed. 7. The fixing device (16) for accommodating the starting side (DA) is mounted so as to be movable when a pulling force is applied (tightened) by gripping an end of the typesetting plate (18). The typesetting exchange apparatus according to any one of items 8 to 8. 10. The plate type changing device according to claim 6, wherein the plate cylinder (10) is provided in a lacquer processing device of a sheet-fed offset printing press.